PROGRESSIVE weld SAMPLING
welding qa/qc & project controls software
PIPING PER ASME B31.3 para. 341.3
Log accepted inspections,
YES
RT or UT
Accepted?
Inspection
and continue per
standard process
NO
341.3.4 (b) If the items examined as required by (a) are
341.3.4 (d) If the items examined as required by (c) are
acceptable, the defective item shall be repaired or
acceptable, the defective item shall be repaired or
replaced & reexamined per 341.3.3. All items represented
replaced & reexamined per 341.3.3. All items represented
by these two additional samples shall be accepted
by these two additional samples shall be accepted
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from the original designated
Results
lot shall be tested
341.3.4 (c) 2 Additional
samples of the same kind,
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from the original designated
Results
1 OR 2
samples of the same kind,
lot shall be tested
REJECTED
341.3.4 (a) 2 Additional
2 ACCEPTED
1 REJECTED
PENALTY“
“TRACER OR
2 ACCEPTED
All items shall be:
341.3.4 (e)(1) Repaired or replaced &
fully reexamined 341.3.4 (e)(2) fully examined and
repaired or replaced as necessary
“TRACER OR PENALTY“
2 REJECTED
B31.3 341.3.3 Defective Components and
Workmanship.
fi
acceptable by the criteria speci ed in para. 341.3.2)
shall be repaired, or the defective item or work shall
341.3.4 (d) If the items examined as required by (c)
PENALTY“
Defects (imperfections of a type or magnitude not
“TRACER OR
ASME
341.3.4 (c) 4 Additional samples
of the same kind, from the
original designated lot shall be
tested
are acceptable, the defective item shall be repaired
or replaced & reexamined per 341.3.3. All items
represented by these two additional samples shall
be accepted
.
be replaced
4 ACCEPTED
When the defective item or work is repaired, the
examined. The examination shall use the same
methods and acceptance criteria employed for the
.
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Results
original examination. See also para. 341.3.1(a)
(b)
When the defective item or work is replaced,
the new item or work used to replace the defective
item or work shall be examined. The examination
shall use any method and applicable acceptance
criteria that meet the requirements for the original
examination. See also para. 341.3.1(a).
FOR REFERENCE ONLY; SEE CURRENT ASME CODES & STANDARDS FOR OFFICIAL INFORMATION
1, 2, 3 OR
(a)
repaired portion of the item or work shall be
4 REJECTED
Examination shall be as follows:
All items shall be:
341.3.4 (e)(1) Repaired or replaced &
fully reexamined 341.3.4 (e)(2) fully examined and
repaired or replaced as necessary
PROGRESSIVE weld SAMPLING
welding qa/qc
VESSEL PER ASME SECTION VIII DIVISION 1
RT or UT
Inspection
Increment
Accepted?
YES
Per UW-52 (d)(1) Log
information in system,
and continue per
standard process
NO
UW-52 (d)(2)(-a) If the items examined as required
by UW-52 (d)(2) are acceptable, the defective item
shall be repaired or replaced & reexamined per
UW-52 (d)(2)(-c). All items represented by these two
additional samples within the increment shall be
accepted
2 ACCEPTED
UW-52 (d)(2) Two additional spot
RT or UT inspections within the
same increment
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Results
1 OR 2 REJECTED
“TRACER OR PENALTY“
ASME Section VIII Division 1
UW-52 SPOT EXAMINATION OF WELDED JOINTS.
NOTE: Spot radiographing of a welded joint is recognized as an effective inspection tool. The spot radiography rules are
also considered to be an aid to quality control. Spot radiographs made directly after a welder or an operator has
completed a unit of weld proves that the work is or is not being done in accordance with a satisfactory procedure. If the
work is unsatisfactory, corrective steps can then be taken to improve the welding in the subsequent units, which
unquestionably will improve the weld quality.
UW-52 (d)(2)(-b) The entire
increment of weld is rejected
Spot radiography in accordance with these rules will not ensure a fabrication product of predetermined quality level
throughout. It must be realized that an accepted vessel under these spot radiography rules may still contain defects
which might be disclosed on further examination. If all radiographically disclosed weld defects must be eliminated from a
vessel, then 100% radiography must be employed.
FOR REFERENCE ONLY; SEE CURRENT ASME CODES & STANDARDS FOR OFFICIAL INFORMATION
& project controls software
ASME Section VIII Division 1
UW-52 SPOT EXAMINATION OF WELDED JOINTS.
(a) Butt welded joints which are to be spot radiographed
shall be examined locally as provided herein.
(b) Minimum Extent of Spot Radiographic Examination
(1) One spot shall be examined on each vessel for
each 50 ft (15 m) increment of weld or fraction thereof
for which a joint efficiency from column (b) of Table UW-12 is
selected. However, for identical vessels or parts, each with less
than 50 ft (15 m) of weld for which a joint efficiency from
column (b) of Table UW-12 is selected,
50 ft (15 m) increments of weld may be represented
by one spot examination.
(2) For each increment of weld to be examined, a
sufficient number of spot radiographs shall be taken to
examine the welding of each welder or welding operator.
Under conditions where two or more welders or welding
operators make weld layers in a joint, or on the two sides of
a double‐welded butt joint, one spot may represent the
work of all welders or welding operators.
(3) Each spot examination shall be made as soon as
practicable after completion of the increment of weld to be
examined. The location of the spot shall be chosen by the
Inspector after completion of the increment of welding to be
examined, except that when the Inspector has been notified in
advance and cannot be present or otherwise make the
selection, the Manufacturer may exercise his own judgment in
selecting the spots.
(4) Radiographs required at specific locations to satisfy the
rules of other paragraphs, such as UW-9(d),
UW-11(a)(5)(-b), and UW-14(b), shall not be used to satisfy
the requirements for spot radiography.
(c) Standards for Spot Radiographic Examination. Spot
examination by radiography shall be made in accordance
with the technique prescribed in UW-51(a). The minimum
length of spot radiograph shall be 6 in. (150 mm).......
CONTINUED........... Read the remainder from the code book to
know and understand all the provisions of the code and how
they apply to each situation.